Can you please tell me which folder you tried to browse (in the log file that you attached) that gave you the error?
Mezzmo dynamically loads the contents of folders as you walk them, so that they always reflect what's on disks, thus it may take a bit more time than other products, but it means you don't have to maintain your library to see new files appear. Thumbnails are also a factor, but they shouldn't hold up much. The attached logs don't show any significant delays though.
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